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Timer IC provides low-power voltage monitor. (design ideas: volume 2, number 15A)
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EDN
- Article date:
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July 21, 1988
- Author:
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Copyright informationCOPYRIGHT 1988 Reed Business Information. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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A timing circuit made of complementary metal-oxide semiconductors (CMOS) monitors battery voltages in the 2 to 5V range and draws little current. The alarm trigger uses the nonlinear variation of the CMOS versions pin five voltage with respect to changes in the positive voltage supply. The voltage monitor alarm remains on until the user resets it manually via a pushbutton switch. Users can add an autoreset resister to reset the alarm. The voltage-monitor circuit is suitable for most time applications.
Timer IC provides low-power voltage monitor A CMOS version of the familiar 555 timer (Fig 1) can monitor battery voltages in the 2 to 15V range while drawing little current (less than 80 ...
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